Never complain and never explain.
Always desire to learn something useful.
To be a good loser is to learn how to win.
If you think you can do it, you can.
After a storm comes a calm.
Either you run the day or the day runs you.
If you can dream it, you can do it.
Be gentle to all and stern with yourself.
The wise does at once what the fool does at last.
Begin to be now what you will be hereafter.
I have taught history on the high school and college levels, and am or have been a lecturer at the Smithsonian, The National Institutes of Health, and numerous colleges and universities, mostly on science fiction and technology subjects.